Final answer:
The secondary oocyte undergoes meiosis II, dividing into a fertilized egg and a second polar body.
Step-by-step explanation:
The secondary oocyte undergoes the division known as meiosis II. Meiosis II is the second division of meiosis, where the secondary oocyte divides into two daughter cells. One of these cells is the fertilized egg, containing all 46 chromosomes, while the other is the second polar body, which usually disintegrates.